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Add bounds checks.
[tcpdump] / print-icmp6.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 #ifndef lint
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp6.c,v 1.72.2.4 2004-03-24 00:14:09 guy Exp $";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #ifdef INET6
32
33 #include <tcpdump-stdinc.h>
34
35 #include <stdio.h>
36 #include <string.h>
37
38 #include "ip6.h"
39 #include "icmp6.h"
40 #include "ipproto.h"
41
42 #include "interface.h"
43 #include "addrtoname.h"
44 #include "extract.h"
45
46 #include "udp.h"
47 #include "ah.h"
48
49 static const char *get_rtpref(u_int);
50 static const char *get_lifetime(u_int32_t);
51 static void print_lladdr(const u_char *, size_t);
52 static void icmp6_opt_print(const u_char *, int);
53 static void mld6_print(const u_char *);
54 static struct udphdr *get_upperlayer(u_char *, u_int *);
55 static void dnsname_print(const u_char *, const u_char *);
56 static void icmp6_nodeinfo_print(u_int, const u_char *, const u_char *);
57 static void icmp6_rrenum_print(const u_char *, const u_char *);
58
59 #ifndef abs
60 #define abs(a) ((0 < (a)) ? (a) : -(a))
61 #endif
62
63 static const char *
64 get_rtpref(u_int v)
65 {
66 static const char *rtpref_str[] = {
67 "medium", /* 00 */
68 "high", /* 01 */
69 "rsv", /* 10 */
70 "low" /* 11 */
71 };
72
73 return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
74 }
75
76 static const char *
77 get_lifetime(u_int32_t v)
78 {
79 static char buf[20];
80
81 if (v == (u_int32_t)~0UL)
82 return "infinity";
83 else {
84 snprintf(buf, sizeof(buf), "%u", v);
85 return buf;
86 }
87 }
88
89 static void
90 print_lladdr(const u_int8_t *p, size_t l)
91 {
92 const u_int8_t *ep, *q;
93
94 q = p;
95 ep = p + l;
96 while (l > 0 && q < ep) {
97 if (q > p)
98 printf(":");
99 printf("%02x", *q++);
100 l--;
101 }
102 }
103
104 static int icmp6_cksum(const struct ip6_hdr *ip6, const struct icmp6_hdr *icp,
105 u_int len)
106 {
107 size_t i;
108 register const u_int16_t *sp;
109 u_int32_t sum;
110 union {
111 struct {
112 struct in6_addr ph_src;
113 struct in6_addr ph_dst;
114 u_int32_t ph_len;
115 u_int8_t ph_zero[3];
116 u_int8_t ph_nxt;
117 } ph;
118 u_int16_t pa[20];
119 } phu;
120
121 /* pseudo-header */
122 memset(&phu, 0, sizeof(phu));
123 phu.ph.ph_src = ip6->ip6_src;
124 phu.ph.ph_dst = ip6->ip6_dst;
125 phu.ph.ph_len = htonl(len);
126 phu.ph.ph_nxt = IPPROTO_ICMPV6;
127
128 sum = 0;
129 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
130 sum += phu.pa[i];
131
132 sp = (const u_int16_t *)icp;
133
134 for (i = 0; i < (len & ~1); i += 2)
135 sum += *sp++;
136
137 if (len & 1)
138 sum += htons((*(const u_int8_t *)sp) << 8);
139
140 while (sum > 0xffff)
141 sum = (sum & 0xffff) + (sum >> 16);
142 sum = ~sum & 0xffff;
143
144 return (sum);
145 }
146
147 void
148 icmp6_print(const u_char *bp, u_int length, const u_char *bp2, int fragmented)
149 {
150 const struct icmp6_hdr *dp;
151 const struct ip6_hdr *ip;
152 const char *str;
153 const struct ip6_hdr *oip;
154 const struct udphdr *ouh;
155 int dport;
156 const u_char *ep;
157 char buf[256];
158 u_int prot;
159
160 dp = (struct icmp6_hdr *)bp;
161 ip = (struct ip6_hdr *)bp2;
162 oip = (struct ip6_hdr *)(dp + 1);
163 str = buf;
164 /* 'ep' points to the end of available data. */
165 ep = snapend;
166
167 TCHECK(dp->icmp6_cksum);
168
169 if (vflag && !fragmented) {
170 int sum = dp->icmp6_cksum;
171
172 if (TTEST2(bp[0], length)) {
173 sum = icmp6_cksum(ip, dp, length);
174 if (sum != 0)
175 (void)printf("[bad icmp6 cksum %x!] ", sum);
176 else
177 (void)printf("[icmp6 sum ok] ");
178 }
179 }
180
181 switch (dp->icmp6_type) {
182 case ICMP6_DST_UNREACH:
183 TCHECK(oip->ip6_dst);
184 switch (dp->icmp6_code) {
185 case ICMP6_DST_UNREACH_NOROUTE:
186 printf("icmp6: %s unreachable route",
187 ip6addr_string(&oip->ip6_dst));
188 break;
189 case ICMP6_DST_UNREACH_ADMIN:
190 printf("icmp6: %s unreachable prohibited",
191 ip6addr_string(&oip->ip6_dst));
192 break;
193 case ICMP6_DST_UNREACH_BEYONDSCOPE:
194 printf("icmp6: %s beyond scope of source address %s",
195 ip6addr_string(&oip->ip6_dst),
196 ip6addr_string(&oip->ip6_src));
197 break;
198 case ICMP6_DST_UNREACH_ADDR:
199 printf("icmp6: %s unreachable address",
200 ip6addr_string(&oip->ip6_dst));
201 break;
202 case ICMP6_DST_UNREACH_NOPORT:
203 if ((ouh = get_upperlayer((u_char *)oip, &prot))
204 == NULL)
205 goto trunc;
206
207 dport = EXTRACT_16BITS(&ouh->uh_dport);
208 switch (prot) {
209 case IPPROTO_TCP:
210 printf("icmp6: %s tcp port %s unreachable",
211 ip6addr_string(&oip->ip6_dst),
212 tcpport_string(dport));
213 break;
214 case IPPROTO_UDP:
215 printf("icmp6: %s udp port %s unreachable",
216 ip6addr_string(&oip->ip6_dst),
217 udpport_string(dport));
218 break;
219 default:
220 printf("icmp6: %s protocol %d port %d unreachable",
221 ip6addr_string(&oip->ip6_dst),
222 oip->ip6_nxt, dport);
223 break;
224 }
225 break;
226 default:
227 printf("icmp6: %s unreachable code-#%d",
228 ip6addr_string(&oip->ip6_dst),
229 dp->icmp6_code);
230 break;
231 }
232 break;
233 case ICMP6_PACKET_TOO_BIG:
234 TCHECK(dp->icmp6_mtu);
235 printf("icmp6: too big %u", EXTRACT_32BITS(&dp->icmp6_mtu));
236 break;
237 case ICMP6_TIME_EXCEEDED:
238 TCHECK(oip->ip6_dst);
239 switch (dp->icmp6_code) {
240 case ICMP6_TIME_EXCEED_TRANSIT:
241 printf("icmp6: time exceeded in-transit for %s",
242 ip6addr_string(&oip->ip6_dst));
243 break;
244 case ICMP6_TIME_EXCEED_REASSEMBLY:
245 printf("icmp6: ip6 reassembly time exceeded");
246 break;
247 default:
248 printf("icmp6: time exceeded code-#%d",
249 dp->icmp6_code);
250 break;
251 }
252 break;
253 case ICMP6_PARAM_PROB:
254 TCHECK(oip->ip6_dst);
255 switch (dp->icmp6_code) {
256 case ICMP6_PARAMPROB_HEADER:
257 printf("icmp6: parameter problem errorneous - octet %u",
258 EXTRACT_32BITS(&dp->icmp6_pptr));
259 break;
260 case ICMP6_PARAMPROB_NEXTHEADER:
261 printf("icmp6: parameter problem next header - octet %u",
262 EXTRACT_32BITS(&dp->icmp6_pptr));
263 break;
264 case ICMP6_PARAMPROB_OPTION:
265 printf("icmp6: parameter problem option - octet %u",
266 EXTRACT_32BITS(&dp->icmp6_pptr));
267 break;
268 default:
269 printf("icmp6: parameter problem code-#%d",
270 dp->icmp6_code);
271 break;
272 }
273 break;
274 case ICMP6_ECHO_REQUEST:
275 case ICMP6_ECHO_REPLY:
276 TCHECK(dp->icmp6_seq);
277 printf("icmp6: echo %s seq %u",
278 dp->icmp6_type == ICMP6_ECHO_REQUEST ?
279 "request" : "reply",
280 EXTRACT_16BITS(&dp->icmp6_seq));
281 break;
282 case ICMP6_MEMBERSHIP_QUERY:
283 printf("icmp6: multicast listener query ");
284 mld6_print((const u_char *)dp);
285 break;
286 case ICMP6_MEMBERSHIP_REPORT:
287 printf("icmp6: multicast listener report ");
288 mld6_print((const u_char *)dp);
289 break;
290 case ICMP6_MEMBERSHIP_REDUCTION:
291 printf("icmp6: multicast listener done ");
292 mld6_print((const u_char *)dp);
293 break;
294 case ND_ROUTER_SOLICIT:
295 printf("icmp6: router solicitation ");
296 if (vflag) {
297 #define RTSOLLEN 8
298 icmp6_opt_print((const u_char *)dp + RTSOLLEN,
299 length - RTSOLLEN);
300 }
301 break;
302 case ND_ROUTER_ADVERT:
303 printf("icmp6: router advertisement");
304 if (vflag) {
305 struct nd_router_advert *p;
306
307 p = (struct nd_router_advert *)dp;
308 TCHECK(p->nd_ra_retransmit);
309 printf("(chlim=%d, ", (int)p->nd_ra_curhoplimit);
310 if (p->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
311 printf("M");
312 if (p->nd_ra_flags_reserved & ND_RA_FLAG_OTHER)
313 printf("O");
314 if (p->nd_ra_flags_reserved & ND_RA_FLAG_HOME_AGENT)
315 printf("H");
316
317 if ((p->nd_ra_flags_reserved & ~ND_RA_FLAG_RTPREF_MASK)
318 != 0)
319 printf(" ");
320
321 printf("pref=%s, ",
322 get_rtpref(p->nd_ra_flags_reserved));
323
324 printf("router_ltime=%d, ", EXTRACT_16BITS(&p->nd_ra_router_lifetime));
325 printf("reachable_time=%u, ",
326 EXTRACT_32BITS(&p->nd_ra_reachable));
327 printf("retrans_time=%u)",
328 EXTRACT_32BITS(&p->nd_ra_retransmit));
329 #define RTADVLEN 16
330 icmp6_opt_print((const u_char *)dp + RTADVLEN,
331 length - RTADVLEN);
332 }
333 break;
334 case ND_NEIGHBOR_SOLICIT:
335 {
336 struct nd_neighbor_solicit *p;
337 p = (struct nd_neighbor_solicit *)dp;
338 TCHECK(p->nd_ns_target);
339 printf("icmp6: neighbor sol: who has %s",
340 ip6addr_string(&p->nd_ns_target));
341 if (vflag) {
342 #define NDSOLLEN 24
343 icmp6_opt_print((const u_char *)dp + NDSOLLEN,
344 length - NDSOLLEN);
345 }
346 }
347 break;
348 case ND_NEIGHBOR_ADVERT:
349 {
350 struct nd_neighbor_advert *p;
351
352 p = (struct nd_neighbor_advert *)dp;
353 TCHECK(p->nd_na_target);
354 printf("icmp6: neighbor adv: tgt is %s",
355 ip6addr_string(&p->nd_na_target));
356 if (vflag) {
357 #define ND_NA_FLAG_ALL \
358 (ND_NA_FLAG_ROUTER|ND_NA_FLAG_SOLICITED|ND_NA_FLAG_OVERRIDE)
359 /* we don't need ntohl() here. see advanced-api-04. */
360 if (p->nd_na_flags_reserved & ND_NA_FLAG_ALL) {
361 #undef ND_NA_FLAG_ALL
362 u_int32_t flags;
363
364 flags = p->nd_na_flags_reserved;
365 printf("(");
366 if (flags & ND_NA_FLAG_ROUTER)
367 printf("R");
368 if (flags & ND_NA_FLAG_SOLICITED)
369 printf("S");
370 if (flags & ND_NA_FLAG_OVERRIDE)
371 printf("O");
372 printf(")");
373 }
374 #define NDADVLEN 24
375 icmp6_opt_print((const u_char *)dp + NDADVLEN,
376 length - NDADVLEN);
377 #undef NDADVLEN
378 }
379 }
380 break;
381 case ND_REDIRECT:
382 #define RDR(i) ((struct nd_redirect *)(i))
383 TCHECK(RDR(dp)->nd_rd_dst);
384 printf("icmp6: redirect %s",
385 getname6((const u_char *)&RDR(dp)->nd_rd_dst));
386 TCHECK(RDR(dp)->nd_rd_target);
387 printf(" to %s",
388 getname6((const u_char*)&RDR(dp)->nd_rd_target));
389 #define REDIRECTLEN 40
390 if (vflag) {
391 icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
392 length - REDIRECTLEN);
393 }
394 break;
395 #undef REDIRECTLEN
396 #undef RDR
397 case ICMP6_ROUTER_RENUMBERING:
398 icmp6_rrenum_print(bp, ep);
399 break;
400 case ICMP6_NI_QUERY:
401 case ICMP6_NI_REPLY:
402 icmp6_nodeinfo_print(length, bp, ep);
403 break;
404 case ICMP6_HADISCOV_REQUEST:
405 printf("icmp6: ha discovery request");
406 if (vflag) {
407 TCHECK(dp->icmp6_data16[0]);
408 printf("(id=%d)", EXTRACT_16BITS(&dp->icmp6_data16[0]));
409 }
410 break;
411 case ICMP6_HADISCOV_REPLY:
412 printf("icmp6: ha discovery reply");
413 if (vflag) {
414 struct in6_addr *in6;
415 u_char *cp;
416
417 TCHECK(dp->icmp6_data16[0]);
418 printf("(id=%d", EXTRACT_16BITS(&dp->icmp6_data16[0]));
419 cp = (u_char *)dp + length;
420 in6 = (struct in6_addr *)(dp + 1);
421 for (; (u_char *)in6 < cp; in6++) {
422 TCHECK(*in6);
423 printf(", %s", ip6addr_string(in6));
424 }
425 printf(")");
426 }
427 break;
428 case ICMP6_MOBILEPREFIX_SOLICIT:
429 printf("icmp6: mobile router solicitation");
430 if (vflag) {
431 TCHECK(dp->icmp6_data16[0]);
432 printf("(id=%d)", EXTRACT_16BITS(&dp->icmp6_data16[0]));
433 }
434 break;
435 case ICMP6_MOBILEPREFIX_ADVERT:
436 printf("icmp6: mobile router advertisement");
437 if (vflag) {
438 TCHECK(dp->icmp6_data16[0]);
439 printf("(id=%d", EXTRACT_16BITS(&dp->icmp6_data16[0]));
440 if (dp->icmp6_data16[1] & 0xc0)
441 printf(" ");
442 if (dp->icmp6_data16[1] & 0x80)
443 printf("M");
444 if (dp->icmp6_data16[1] & 0x40)
445 printf("O");
446 printf(")");
447 #define MPADVLEN 8
448 icmp6_opt_print((const u_char *)dp + MPADVLEN,
449 length - MPADVLEN);
450 }
451 break;
452 default:
453 printf("icmp6: type-#%d", dp->icmp6_type);
454 break;
455 }
456 return;
457 trunc:
458 fputs("[|icmp6]", stdout);
459 }
460
461 static struct udphdr *
462 get_upperlayer(u_char *bp, u_int *prot)
463 {
464 const u_char *ep;
465 struct ip6_hdr *ip6 = (struct ip6_hdr *)bp;
466 struct udphdr *uh;
467 struct ip6_hbh *hbh;
468 struct ip6_frag *fragh;
469 struct ah *ah;
470 u_int nh;
471 int hlen;
472
473 /* 'ep' points to the end of available data. */
474 ep = snapend;
475
476 if (!TTEST(ip6->ip6_nxt))
477 return NULL;
478
479 nh = ip6->ip6_nxt;
480 hlen = sizeof(struct ip6_hdr);
481
482 while (bp < snapend) {
483 bp += hlen;
484
485 switch(nh) {
486 case IPPROTO_UDP:
487 case IPPROTO_TCP:
488 uh = (struct udphdr *)bp;
489 if (TTEST(uh->uh_dport)) {
490 *prot = nh;
491 return(uh);
492 }
493 else
494 return(NULL);
495 /* NOTREACHED */
496
497 case IPPROTO_HOPOPTS:
498 case IPPROTO_DSTOPTS:
499 case IPPROTO_ROUTING:
500 hbh = (struct ip6_hbh *)bp;
501 if (!TTEST(hbh->ip6h_len))
502 return(NULL);
503 nh = hbh->ip6h_nxt;
504 hlen = (hbh->ip6h_len + 1) << 3;
505 break;
506
507 case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
508 fragh = (struct ip6_frag *)bp;
509 if (!TTEST(fragh->ip6f_offlg))
510 return(NULL);
511 /* fragments with non-zero offset are meaningless */
512 if ((EXTRACT_16BITS(&fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
513 return(NULL);
514 nh = fragh->ip6f_nxt;
515 hlen = sizeof(struct ip6_frag);
516 break;
517
518 case IPPROTO_AH:
519 ah = (struct ah *)bp;
520 if (!TTEST(ah->ah_len))
521 return(NULL);
522 nh = ah->ah_nxt;
523 hlen = (ah->ah_len + 2) << 2;
524 break;
525
526 default: /* unknown or undecodable header */
527 *prot = nh; /* meaningless, but set here anyway */
528 return(NULL);
529 }
530 }
531
532 return(NULL); /* should be notreached, though */
533 }
534
535 static void
536 icmp6_opt_print(const u_char *bp, int resid)
537 {
538 const struct nd_opt_hdr *op;
539 const struct nd_opt_hdr *opl; /* why there's no struct? */
540 const struct nd_opt_prefix_info *opp;
541 const struct icmp6_opts_redirect *opr;
542 const struct nd_opt_mtu *opm;
543 const struct nd_opt_advinterval *opa;
544 const struct nd_opt_homeagent_info *oph;
545 const struct nd_opt_route_info *opri;
546 const u_char *cp, *ep;
547 struct in6_addr in6, *in6p;
548 size_t l;
549
550 #define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return
551
552 cp = bp;
553 /* 'ep' points to the end of available data. */
554 ep = snapend;
555
556 while (cp < ep) {
557 op = (struct nd_opt_hdr *)cp;
558
559 ECHECK(op->nd_opt_len);
560 if (resid <= 0)
561 return;
562 if (op->nd_opt_len == 0)
563 goto trunc;
564 if (cp + (op->nd_opt_len << 3) > ep)
565 goto trunc;
566
567 switch (op->nd_opt_type) {
568 case ND_OPT_SOURCE_LINKADDR:
569 opl = (struct nd_opt_hdr *)op;
570 printf("(src lladdr: ");
571 l = (op->nd_opt_len << 3) - 2;
572 print_lladdr(cp + 2, l);
573 /*(*/
574 printf(")");
575 break;
576 case ND_OPT_TARGET_LINKADDR:
577 opl = (struct nd_opt_hdr *)op;
578 printf("(tgt lladdr: ");
579 l = (op->nd_opt_len << 3) - 2;
580 print_lladdr(cp + 2, l);
581 /*(*/
582 printf(")");
583 break;
584 case ND_OPT_PREFIX_INFORMATION:
585 opp = (struct nd_opt_prefix_info *)op;
586 TCHECK(opp->nd_opt_pi_prefix);
587 printf("(prefix info: "); /*)*/
588 if (op->nd_opt_len != 4) {
589 printf("badlen");
590 /*(*/
591 printf(")");
592 break;
593 }
594 if (opp->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)
595 printf("L");
596 if (opp->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO)
597 printf("A");
598 if (opp->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ROUTER)
599 printf("R");
600 if (opp->nd_opt_pi_flags_reserved)
601 printf(" ");
602 printf("valid_ltime=%s,",
603 get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_valid_time)));
604 printf("preferred_ltime=%s,",
605 get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_preferred_time)));
606 printf("prefix=%s/%d",
607 ip6addr_string(&opp->nd_opt_pi_prefix),
608 opp->nd_opt_pi_prefix_len);
609 if (opp->nd_opt_pi_len != 4)
610 printf("!");
611 /*(*/
612 printf(")");
613 break;
614 case ND_OPT_REDIRECTED_HEADER:
615 opr = (struct icmp6_opts_redirect *)op;
616 printf("(redirect)");
617 /* xxx */
618 break;
619 case ND_OPT_MTU:
620 opm = (struct nd_opt_mtu *)op;
621 TCHECK(opm->nd_opt_mtu_mtu);
622 printf("(mtu:"); /*)*/
623 if (op->nd_opt_len != 1) {
624 printf("badlen");
625 /*(*/
626 printf(")");
627 break;
628 }
629 printf(" mtu=%u", EXTRACT_32BITS(&opm->nd_opt_mtu_mtu));
630 if (opm->nd_opt_mtu_len != 1)
631 printf("!");
632 printf(")");
633 break;
634 case ND_OPT_ADVINTERVAL:
635 opa = (struct nd_opt_advinterval *)op;
636 TCHECK(opa->nd_opt_adv_interval);
637 printf("(advint:"); /*)*/
638 printf(" advint=%u",
639 EXTRACT_32BITS(&opa->nd_opt_adv_interval));
640 /*(*/
641 printf(")");
642 break;
643 case ND_OPT_HOMEAGENT_INFO:
644 oph = (struct nd_opt_homeagent_info *)op;
645 TCHECK(oph->nd_opt_hai_lifetime);
646 printf("(ha info:"); /*)*/
647 printf(" pref=%d", EXTRACT_16BITS(&oph->nd_opt_hai_preference));
648 printf(", lifetime=%u", EXTRACT_16BITS(&oph->nd_opt_hai_lifetime));
649 printf(")");
650 break;
651 case ND_OPT_ROUTE_INFO:
652 opri = (struct nd_opt_route_info *)op;
653 TCHECK(opri->nd_opt_rti_lifetime);
654 memset(&in6, 0, sizeof(in6));
655 in6p = (struct in6_addr *)(opri + 1);
656 switch (op->nd_opt_len) {
657 case 1:
658 break;
659 case 2:
660 TCHECK2(*in6p, 8);
661 memcpy(&in6, opri + 1, 8);
662 break;
663 case 3:
664 TCHECK(*in6p);
665 memcpy(&in6, opri + 1, sizeof(in6));
666 break;
667 default:
668 goto trunc;
669 }
670 printf("(rtinfo:"); /*)*/
671 printf(" %s/%u", ip6addr_string(&in6),
672 opri->nd_opt_rti_prefixlen);
673 printf(", pref=%s", get_rtpref(opri->nd_opt_rti_flags));
674 printf(", lifetime=%s",
675 get_lifetime(EXTRACT_32BITS(&opri->nd_opt_rti_lifetime)));
676 /*(*/
677 printf(")");
678 break;
679 default:
680 printf("(unknown opt_type=%d, opt_len=%d)",
681 op->nd_opt_type, op->nd_opt_len);
682 break;
683 }
684
685 cp += op->nd_opt_len << 3;
686 resid -= op->nd_opt_len << 3;
687 }
688 return;
689
690 trunc:
691 fputs("[ndp opt]", stdout);
692 return;
693 #undef ECHECK
694 }
695
696 static void
697 mld6_print(const u_char *bp)
698 {
699 struct mld6_hdr *mp = (struct mld6_hdr *)bp;
700 const u_char *ep;
701
702 /* 'ep' points to the end of available data. */
703 ep = snapend;
704
705 if ((u_char *)mp + sizeof(*mp) > ep)
706 return;
707
708 printf("max resp delay: %d ", EXTRACT_16BITS(&mp->mld6_maxdelay));
709 printf("addr: %s", ip6addr_string(&mp->mld6_addr));
710 }
711
712 static void
713 dnsname_print(const u_char *cp, const u_char *ep)
714 {
715 int i;
716
717 /* DNS name decoding - no decompression */
718 printf(", \"");
719 while (cp < ep) {
720 i = *cp++;
721 if (i) {
722 if (i > ep - cp) {
723 printf("???");
724 break;
725 }
726 while (i-- && cp < ep) {
727 safeputchar(*cp);
728 cp++;
729 }
730 if (cp + 1 < ep && *cp)
731 printf(".");
732 } else {
733 if (cp == ep) {
734 /* FQDN */
735 printf(".");
736 } else if (cp + 1 == ep && *cp == '\0') {
737 /* truncated */
738 } else {
739 /* invalid */
740 printf("???");
741 }
742 break;
743 }
744 }
745 printf("\"");
746 }
747
748 static void
749 icmp6_nodeinfo_print(u_int icmp6len, const u_char *bp, const u_char *ep)
750 {
751 struct icmp6_nodeinfo *ni6;
752 struct icmp6_hdr *dp;
753 const u_char *cp;
754 size_t siz, i;
755 int needcomma;
756
757 if (ep < bp)
758 return;
759 dp = (struct icmp6_hdr *)bp;
760 ni6 = (struct icmp6_nodeinfo *)bp;
761 siz = ep - bp;
762
763 switch (ni6->ni_type) {
764 case ICMP6_NI_QUERY:
765 if (siz == sizeof(*dp) + 4) {
766 /* KAME who-are-you */
767 printf("icmp6: who-are-you request");
768 break;
769 }
770 printf("icmp6: node information query");
771
772 TCHECK2(*dp, sizeof(*ni6));
773 ni6 = (struct icmp6_nodeinfo *)dp;
774 printf(" ("); /*)*/
775 switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
776 case NI_QTYPE_NOOP:
777 printf("noop");
778 break;
779 case NI_QTYPE_SUPTYPES:
780 printf("supported qtypes");
781 i = EXTRACT_16BITS(&ni6->ni_flags);
782 if (i)
783 printf(" [%s]", (i & 0x01) ? "C" : "");
784 break;
785 break;
786 case NI_QTYPE_FQDN:
787 printf("DNS name");
788 break;
789 case NI_QTYPE_NODEADDR:
790 printf("node addresses");
791 i = ni6->ni_flags;
792 if (!i)
793 break;
794 /* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
795 printf(" [%s%s%s%s%s%s]",
796 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
797 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
798 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
799 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
800 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
801 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
802 break;
803 default:
804 printf("unknown");
805 break;
806 }
807
808 if (ni6->ni_qtype == NI_QTYPE_NOOP ||
809 ni6->ni_qtype == NI_QTYPE_SUPTYPES) {
810 if (siz != sizeof(*ni6))
811 if (vflag)
812 printf(", invalid len");
813 /*(*/
814 printf(")");
815 break;
816 }
817
818
819 /* XXX backward compat, icmp-name-lookup-03 */
820 if (siz == sizeof(*ni6)) {
821 printf(", 03 draft");
822 /*(*/
823 printf(")");
824 break;
825 }
826
827 switch (ni6->ni_code) {
828 case ICMP6_NI_SUBJ_IPV6:
829 if (!TTEST2(*dp,
830 sizeof(*ni6) + sizeof(struct in6_addr)))
831 break;
832 if (siz != sizeof(*ni6) + sizeof(struct in6_addr)) {
833 if (vflag)
834 printf(", invalid subject len");
835 break;
836 }
837 printf(", subject=%s",
838 getname6((const u_char *)(ni6 + 1)));
839 break;
840 case ICMP6_NI_SUBJ_FQDN:
841 printf(", subject=DNS name");
842 cp = (const u_char *)(ni6 + 1);
843 if (cp[0] == ep - cp - 1) {
844 /* icmp-name-lookup-03, pascal string */
845 if (vflag)
846 printf(", 03 draft");
847 cp++;
848 printf(", \"");
849 while (cp < ep) {
850 safeputchar(*cp);
851 cp++;
852 }
853 printf("\"");
854 } else
855 dnsname_print(cp, ep);
856 break;
857 case ICMP6_NI_SUBJ_IPV4:
858 if (!TTEST2(*dp, sizeof(*ni6) + sizeof(struct in_addr)))
859 break;
860 if (siz != sizeof(*ni6) + sizeof(struct in_addr)) {
861 if (vflag)
862 printf(", invalid subject len");
863 break;
864 }
865 printf(", subject=%s",
866 getname((const u_char *)(ni6 + 1)));
867 break;
868 default:
869 printf(", unknown subject");
870 break;
871 }
872
873 /*(*/
874 printf(")");
875 break;
876
877 case ICMP6_NI_REPLY:
878 if (icmp6len > siz) {
879 printf("[|icmp6: node information reply]");
880 break;
881 }
882
883 needcomma = 0;
884
885 ni6 = (struct icmp6_nodeinfo *)dp;
886 printf("icmp6: node information reply");
887 printf(" ("); /*)*/
888 switch (ni6->ni_code) {
889 case ICMP6_NI_SUCCESS:
890 if (vflag) {
891 printf("success");
892 needcomma++;
893 }
894 break;
895 case ICMP6_NI_REFUSED:
896 printf("refused");
897 needcomma++;
898 if (siz != sizeof(*ni6))
899 if (vflag)
900 printf(", invalid length");
901 break;
902 case ICMP6_NI_UNKNOWN:
903 printf("unknown");
904 needcomma++;
905 if (siz != sizeof(*ni6))
906 if (vflag)
907 printf(", invalid length");
908 break;
909 }
910
911 if (ni6->ni_code != ICMP6_NI_SUCCESS) {
912 /*(*/
913 printf(")");
914 break;
915 }
916
917 switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
918 case NI_QTYPE_NOOP:
919 if (needcomma)
920 printf(", ");
921 printf("noop");
922 if (siz != sizeof(*ni6))
923 if (vflag)
924 printf(", invalid length");
925 break;
926 case NI_QTYPE_SUPTYPES:
927 if (needcomma)
928 printf(", ");
929 printf("supported qtypes");
930 i = EXTRACT_16BITS(&ni6->ni_flags);
931 if (i)
932 printf(" [%s]", (i & 0x01) ? "C" : "");
933 break;
934 case NI_QTYPE_FQDN:
935 if (needcomma)
936 printf(", ");
937 printf("DNS name");
938 cp = (const u_char *)(ni6 + 1) + 4;
939 if (cp[0] == ep - cp - 1) {
940 /* icmp-name-lookup-03, pascal string */
941 if (vflag)
942 printf(", 03 draft");
943 cp++;
944 printf(", \"");
945 while (cp < ep) {
946 safeputchar(*cp);
947 cp++;
948 }
949 printf("\"");
950 } else
951 dnsname_print(cp, ep);
952 if ((EXTRACT_16BITS(&ni6->ni_flags) & 0x01) != 0)
953 printf(" [TTL=%u]", *(u_int32_t *)(ni6 + 1));
954 break;
955 case NI_QTYPE_NODEADDR:
956 if (needcomma)
957 printf(", ");
958 printf("node addresses");
959 i = sizeof(*ni6);
960 while (i < siz) {
961 if (i + sizeof(struct in6_addr) + sizeof(int32_t) > siz)
962 break;
963 printf(" %s", getname6(bp + i));
964 i += sizeof(struct in6_addr);
965 printf("(%d)", (int32_t)EXTRACT_32BITS(bp + i));
966 i += sizeof(int32_t);
967 }
968 i = ni6->ni_flags;
969 if (!i)
970 break;
971 printf(" [%s%s%s%s%s%s%s]",
972 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
973 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
974 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
975 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
976 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
977 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
978 (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
979 break;
980 default:
981 if (needcomma)
982 printf(", ");
983 printf("unknown");
984 break;
985 }
986
987 /*(*/
988 printf(")");
989 break;
990 }
991 return;
992
993 trunc:
994 fputs("[|icmp6]", stdout);
995 }
996
997 static void
998 icmp6_rrenum_print(const u_char *bp, const u_char *ep)
999 {
1000 struct icmp6_router_renum *rr6;
1001 struct icmp6_hdr *dp;
1002 size_t siz;
1003 const char *cp;
1004 struct rr_pco_match *match;
1005 struct rr_pco_use *use;
1006 char hbuf[NI_MAXHOST];
1007 int n;
1008
1009 if (ep < bp)
1010 return;
1011 dp = (struct icmp6_hdr *)bp;
1012 rr6 = (struct icmp6_router_renum *)bp;
1013 siz = ep - bp;
1014 cp = (const char *)(rr6 + 1);
1015
1016 TCHECK(rr6->rr_reserved);
1017 switch (rr6->rr_code) {
1018 case ICMP6_ROUTER_RENUMBERING_COMMAND:
1019 printf("router renum: command");
1020 break;
1021 case ICMP6_ROUTER_RENUMBERING_RESULT:
1022 printf("router renum: result");
1023 break;
1024 case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
1025 printf("router renum: sequence number reset");
1026 break;
1027 default:
1028 printf("router renum: code-#%d", rr6->rr_code);
1029 break;
1030 }
1031
1032 printf(", seq=%u", EXTRACT_32BITS(&rr6->rr_seqnum));
1033
1034 if (vflag) {
1035 #define F(x, y) ((rr6->rr_flags) & (x) ? (y) : "")
1036 printf("["); /*]*/
1037 if (rr6->rr_flags) {
1038 printf("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
1039 F(ICMP6_RR_FLAGS_REQRESULT, "R"),
1040 F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
1041 F(ICMP6_RR_FLAGS_SPECSITE, "S"),
1042 F(ICMP6_RR_FLAGS_PREVDONE, "P"));
1043 }
1044 printf("seg=%u,", rr6->rr_segnum);
1045 printf("maxdelay=%u", rr6->rr_maxdelay);
1046 if (rr6->rr_reserved)
1047 printf("rsvd=0x%x", EXTRACT_16BITS(&rr6->rr_reserved));
1048 /*[*/
1049 printf("]");
1050 #undef F
1051 }
1052
1053 if (rr6->rr_code == ICMP6_ROUTER_RENUMBERING_COMMAND) {
1054 match = (struct rr_pco_match *)cp;
1055 cp = (const char *)(match + 1);
1056
1057 TCHECK(match->rpm_prefix);
1058
1059 if (vflag > 1)
1060 printf("\n\t");
1061 else
1062 printf(" ");
1063 printf("match("); /*)*/
1064 switch (match->rpm_code) {
1065 case RPM_PCO_ADD: printf("add"); break;
1066 case RPM_PCO_CHANGE: printf("change"); break;
1067 case RPM_PCO_SETGLOBAL: printf("setglobal"); break;
1068 default: printf("#%u", match->rpm_code); break;
1069 }
1070
1071 if (vflag) {
1072 printf(",ord=%u", match->rpm_ordinal);
1073 printf(",min=%u", match->rpm_minlen);
1074 printf(",max=%u", match->rpm_maxlen);
1075 }
1076 if (inet_ntop(AF_INET6, &match->rpm_prefix, hbuf, sizeof(hbuf)))
1077 printf(",%s/%u", hbuf, match->rpm_matchlen);
1078 else
1079 printf(",?/%u", match->rpm_matchlen);
1080 /*(*/
1081 printf(")");
1082
1083 n = match->rpm_len - 3;
1084 if (n % 4)
1085 goto trunc;
1086 n /= 4;
1087 while (n-- > 0) {
1088 use = (struct rr_pco_use *)cp;
1089 cp = (const char *)(use + 1);
1090
1091 TCHECK(use->rpu_prefix);
1092
1093 if (vflag > 1)
1094 printf("\n\t");
1095 else
1096 printf(" ");
1097 printf("use("); /*)*/
1098 if (use->rpu_flags) {
1099 #define F(x, y) ((use->rpu_flags) & (x) ? (y) : "")
1100 printf("%s%s,",
1101 F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
1102 F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
1103 #undef F
1104 }
1105 if (vflag) {
1106 printf("mask=0x%x,", use->rpu_ramask);
1107 printf("raflags=0x%x,", use->rpu_raflags);
1108 if (~use->rpu_vltime == 0)
1109 printf("vltime=infty,");
1110 else
1111 printf("vltime=%u,",
1112 EXTRACT_32BITS(&use->rpu_vltime));
1113 if (~use->rpu_pltime == 0)
1114 printf("pltime=infty,");
1115 else
1116 printf("pltime=%u,",
1117 EXTRACT_32BITS(&use->rpu_pltime));
1118 }
1119 if (inet_ntop(AF_INET6, &use->rpu_prefix, hbuf,
1120 sizeof(hbuf)))
1121 printf("%s/%u/%u", hbuf, use->rpu_uselen,
1122 use->rpu_keeplen);
1123 else
1124 printf("?/%u/%u", use->rpu_uselen,
1125 use->rpu_keeplen);
1126 /*(*/
1127 printf(")");
1128 }
1129 }
1130
1131 return;
1132
1133 trunc:
1134 fputs("[|icmp6]", stdout);
1135 }
1136
1137 #endif /* INET6 */
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